The information about the Luggnaggians which the narrator
(Gulliver) offers to his audience (English people) is their traditional
customs. At some fact of the story, Gulliver gives his view on the way to
points of views of Luggnaggians by telling it in order to make his spectators
learn the conceivable errors of others and not to do it again.
B. A possessive noun should have its instead of it's (which is a contraction for it is).
For A. Diana is a singular noun and the apostrophe should come after the r instead of after the s.
For C. The duck would've dunked ITS instead of IT'S beak since it is possessive.
For D. You do not need to put an apostrophe since theirs is already a possessive noun.
A time that I often use acronyms is PEMDAS for math. PEMDAS stands for Parentheses Exponents Multiply Divide Add Subtract. This particular acronym is used for simplifying expressions with 2 or more operations. This was a very useful technique because it really stuck in the brain and helped me remember which order to simplify the expression.
Hope this helps :)
What sentence? If you mean the question, then yes, I guess so, but whatever comes after that is not...